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23 February 2006 <br /> . AGE-NC Project No 04-1214 <br /> Page 2 of 4 <br /> using an Oakton water analyzer Purged ground water was containerized in properly labeled, <br /> Department of Transportation(DOT)-approved 55-gallon drums and stored on-site Field sheets and <br /> data are included in Appendix B <br /> 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Ground water samples were collected from the purged wells using new disposable plastic bailers <br /> after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each <br /> sample was transferred into three 40-milliliter(ml)EPA-approved volatile organic analysis(VOA) <br /> vials and three 1-liter amber bottles Samples were properly labeled,stored in a chilled container and <br /> transported under chain of custody to Cal Tech Environmental Laboratories (CTEL), a California <br /> Department of Health Services (DHS)-certified laboratory, for analysis Each sample was analyzed <br /> for <br /> • Chlorinated Pesticides and Herbicides in accordance with EPA 8141 and EPA 8151 and <br /> • Ammonia, nitrate and pH in accordance with EPA Methods 350 2, 300 and 150 1 <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction,and gradient were determined from field data collected on <br /> 10 January 2006, contaminant impact to ground water was quantified from laboratory data <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> Depths to ground water during the January 2006 monitoring event ranged from 2191 feet(MW-103) <br /> to 25 53 feet(MW-101)below the tops of the well casings The calculated ground water elevations <br /> ranged from 3 5 17 feet (MW-104) to 3 5 41 feet (MW-102) above MSL The ground water flow <br /> direction was inferred to be west to northwest, at a ground water gradient of 0 0006 foot/foot(ft/ft) <br /> northwest of well MW-101 The groundwater flow direction and gradient are depicted in Figure 3 <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> Chlorinated pesticides were not detected in the ground water samples from the wells at Ripon Farm <br /> Service Additionally,ammonia and nitrates were not detected in the ground water samples collected <br /> . from monitoring wells MW-101 through MW-104 at RFS The pl-I values ranged from 7 0 (MW- <br /> Advanced GeoEnvironmentat,Inc <br />